Die Kristallstruktur von Lanthantrifluorid
Abstract
The LaF3 structure has previously been described in the space group P63/mmc with two formula units per unit cell. Weak additional reflections on single-crystal photographs lead to a larger unit cell with a = 7.190 ± 0.002 Å, c = 7.367 ± 0.002 Å, space group P[unk]c1, and six LaF3 per unit cell. The structure has been refined by full-matrix least-squares computations. The deviation from the high symmetry is caused by displacements of the F ions. LaF3 is shown to be isotypic with HoD3. The calculated ionic-lattice energy (−1151.6kcal/mole) agrees with the energy calculated by a Born-Haber cycle (−1144.4 kcal/mole). The probable critical radius ratio for the change from the LaF3 to the orthorhombic YF3 structure is 0.94. For smaller ratios the LaF3 structure can be stabilized by anion vacancies.
Articles in the same Issue
- The formation of a spinel and a hexagonal ferrite by the thermal transformation of cronstedtite
- Growth of NaCl whiskers on NaCl single crystals
- A condensed way of representing inorganic close-packed structures
- Systematic derivation of inorganic close-packed structures: AX and AX2 compounds, sequence of equal layers
- Die Kristallstruktur von Lanthantrifluorid
- Über Verbindungen vom Anti-LaF3-Strukturtyp
- Atomanordnung und Strukturverfeinerung von Cancrinit
- The crystal structure of YB4
- The crystal structure of rathite-I*
- A phase transition in potassium chromium sulphate alum at low temperature
- Origin of dislocations in solution-grown crystals
- L'oxonium dans certains composés uranifères
- An x-ray study of metal complexes of biguanide
- A preliminary investigation of the structure of mercury dibenzyl
Articles in the same Issue
- The formation of a spinel and a hexagonal ferrite by the thermal transformation of cronstedtite
- Growth of NaCl whiskers on NaCl single crystals
- A condensed way of representing inorganic close-packed structures
- Systematic derivation of inorganic close-packed structures: AX and AX2 compounds, sequence of equal layers
- Die Kristallstruktur von Lanthantrifluorid
- Über Verbindungen vom Anti-LaF3-Strukturtyp
- Atomanordnung und Strukturverfeinerung von Cancrinit
- The crystal structure of YB4
- The crystal structure of rathite-I*
- A phase transition in potassium chromium sulphate alum at low temperature
- Origin of dislocations in solution-grown crystals
- L'oxonium dans certains composés uranifères
- An x-ray study of metal complexes of biguanide
- A preliminary investigation of the structure of mercury dibenzyl
